-- Last Updated: Oct-23-13 3:41 PM EST --
I find that my rear lines, as described, have enough forward slope that I really can't push the boat forward much at all, though admittedly, it's not quite as effective as a straight-line pull would be (though speaking of straight line pull, I don't understand why one would multiply the length of line by 6 or 8 times via that pulley effect of going around the thwart, when the resulting extra line running 2/3rds the length of the boat accomplishes nothing except to increase the the stretch factor). Anyway, I mainly intend for the lines I described to restrict boat movement in three directions IF the rack were to fail, while your method only keeps the boat from going forward, and only when the rack does not fail. I think the most likely situation where right/left/forward control is needed would be after rack failure due to a front-end collision (the car might be wrecked, but maybe at least the boat will still be okay if not allowed to take off on impact). On that note though, I'm sure the attachment of the rack to the roof of your pickup-truck topper is a lot more secure than a lot of standard car-roof attachments.
No method does all things perfectly. Still, you are the first person (other than the original poster here) that I've encountered who has a method to stop forward slippage that isn't simply dependent on the belly straps and/or gunwale brackets (both of which may be okay, but again, not if the rack fails).
URCHIN Portable Anchor
Canoe Pack Liner
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